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Saturday, 31 October

JEE Main · Chemistry · Thermodynamics (Chemistry)

Gibbs Energy and Equil

JEE Main asked Gibbs Energy and Equil 10 times in 10 of the 108 shifts Lumi analysed, in 2021, 2022, 2023, 2024 and 2026. It belongs to Gibbs Free Energy, in Thermodynamics (Chemistry) (Chemistry). The longest wait between two years asking it was 2 years. In 2021, 2022, 2024 and 2026 it came in more than one shift of the same year.

Updated 2026-10-24

Times asked
10
in 10 shifts
Years
5 of 8
First asked
2021
last in 2026
Pattern
Asked most years
across the analysed shifts

Questions on this idea a shift, by year

2017–2026. Asked in 2021, 2022, 2023, 2024 and 2026. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift of 25 Chemistry questions.

00.150.30’170’200.07’210.10’220.07’230.09’240’250.22’26

Raw count: 2017: 0 in 1 shift · 2020: 0 in 12 shifts · 2021: 2 in 24 shifts · 2022: 3 in 24 shifts · 2023: 1 in 12 shifts · 2024: 2 in 18 shifts · 2025: 0 in 8 shifts · 2026: 2 in 9 shifts.

Shift by shift

Each square is one analysed shift, in date order. Open a filled one for that paper.

  • 20262 of 9
  • 20250 of 8
  • 20242 of 18
  • 20231 of 12
  • 20223 of 24
  • 20212 of 24
  • 20200 of 12
  • 20170 of 1

Asked in that shift More than once Not asked

How JEE Main framed it

Numerical value is the usual form. Skill tested: calculation.

  • Standard free energy from dissociation
  • Entropy change from enthalpy and k

Difficulty

Easy 3Medium 6Hard 1

9 of the 10 questions had a numerical answer.

Every question

All 10 questions

From the official JEE Main shift papers, newest first. Open one for the full question, the options and the official answer.

  1. 6 Apr 2026, Shift 1 · Q75Consider the reaction X⇌Y\mathrm{X\rightleftharpoons Y} at 300 K. If ΔHθ\Delta H^\theta and K are 28.40 kJ mol−1^{-1} and 1.8×10−71.8\times10^{-7}…MediumNumerical value
  2. 4 Apr 2026, Shift 2 · Q72For the following reaction at 50 ∘^\circC and at 2 atm pressure, 2N2O5(g)⇌2N2O4(g)+O2(g)\mathrm{2N_2O_5(g)\rightleftharpoons2N_2O_4(g)+O_2(g)}…HardNumerical value
  3. 31 Jan 2024, Shift 1 · Q84Consider the following reaction at 298 K. 32O2(g)⇌O3(g)\frac{3}{2}\mathrm{O_{2(g)}} \rightleftharpoons \mathrm{O_{3(g)}}.…EasyNumerical value
  4. 1 Feb 2024, Shift 2 · Q82For a certain reaction at 300K, K = 10, then ΔG∘\Delta G^\circ for the same reaction is −- ________ ×10−1\times 10^{-1} kJ mol−1^{-1}. (Given…EasyNumerical value
  5. 6 Apr 2023, Shift 1 · Q84The value of log K for the reaction A⇌B\mathrm{A \rightleftharpoons B} at 298 K is ________. (Nearest integer) Given:…MediumNumerical value
  6. 26 Jun 2022, Shift 2 · Q8640% of HI undergoes decompostion to H2\mathrm{H_2} and I2\mathrm{I_2} at 300 K. ΔG⊖\Delta G^\ominus for this decompostion reaction at one…MediumNumerical value
  7. 25 Jun 2022, Shift 1 · Q84The standard entropy change for the reaction 4Fe(s)+3O2(g)→2Fe2O3(s)4\mathrm{Fe(s)} + 3\mathrm{O_2(g)} \rightarrow 2\mathrm{Fe_2O_3(s)} is…EasyNumerical value
  8. 24 Jun 2022, Shift 1 · Q822O3(g)⇌3O2(g)\mathrm{2O_3(g)\rightleftharpoons 3O_2(g)} At 300 K, ozone is fifty percent dissociated. The standard free energy change at this…MediumNumerical value
  9. 24 Feb 2021, Shift 2 · Q53Assuming ideal behaviour, the magnitude of log K for the following reaction at 25∘25^\circC is x×10−1x \times 10^{-1}. The value of xx is…MediumNumerical value
  10. 31 Aug 2021, Shift 2 · Q31The incorrect expression among the following is :MediumSingle correct

Shifts: 24 Feb 2021, Shift 2, 31 Aug 2021, Shift 2, 24 Jun 2022, Shift 1, 25 Jun 2022, Shift 1, 26 Jun 2022, Shift 2, 6 Apr 2023, Shift 1, 31 Jan 2024, Shift 1, 1 Feb 2024, Shift 2, 4 Apr 2026, Shift 2, 6 Apr 2026, Shift 1.

Same topic

Other ideas in Gibbs Free Energy

Gibbs Free Energy has 15 ideas JEE Main has asked; 5 of them came up in more than one question. The 12 most asked are below.

Topic analysisChapter analysisStudy this chapterAll repeated ideas